The OEIS is looking to hire part-time people to help edit core sequences, upload scanned documents, process citations, fix broken links, etc. - Neil Sloane, njasloane@gmail.com
1,2
Remi Eismann, Table of n, a(n) for n = 1..10000
Join[{1}, Divisors[#][[2]]&/@Range[3, 161, 2]] (* Harvey P. Dale, Oct 09 2011 *)
(PARI) a(n)=if(n>1, factor(2*n-1)[1, 1], 1) \\ Charles R Greathouse IV, Nov 09 2016
Bisection of A020639.
Cf. A100773.
Sequence in context: A255562 A130140 A051417 * A120374 A088836 A076565
Adjacent sequences: A090365 A090366 A090367 * A090369 A090370 A090371
nonn
Lekraj Beedassy, Nov 27 2003
More terms from Ray Chandler, Dec 02 2003
Definition corrected by Rémi Eismann, May 08 2007
approved